TC500A-N/TC500A-W COMMERCIAL THERMOSTAT
31-00399M-02 | Rev.03-21
2
WHEN NOT USED TO SENSE ROOM TEMPERATURE
When using the remote-mounted temperature (and
humidity) sensor(s) to sense ambient conditions, install
the Thermostat in an area that is accessible for setting and
adjusting the temperature and settings.
Fig. 1. Typical mounting location of thermostat
This symbol on our product shows a crossed-out “wheelie-
bin” as required by law regarding the Waste of
Electrical and Electronic Equipment (WEEE) disposal. This
indicates your responsibility to contribute in saving
the environment by proper disposal of this Waste i.e. Do not
dispose of this product with your other wastes. To
know the right disposal mechanism please check the
applicable law.
Regulation (EC) No 1907/2006
According to Article 33 of Reach Regulation be informed
that the substances listed below may be contained in these
products above the threshold level of 0.1% by weight of the
listed article.
Power supply guidelines and
requirements
The thermostat uses 24VAC power from a UL Listed Class-
2 24VAC transformer (not provided in the kit). It also uses a
half-wave rectifier to convert the AC power supply to
onboard power. This enables multiple devices with half-
wave power supplies to be powered from a single,
grounded transformer.
WARNING
Half wave devices and full wave devices must not use the
same AC transformer.
You must maintain wiring polarity. Failure to do so
can result in equipment damage. If the HVAC
equipment has an internal circuit board that is
powered by the same transformer that will power
the Thermostat, verify that it is NOT full wave.
Fig. 2. Power terminals
Power supply wire sizing
Long power supply wiring runs require selecting the wire
gauge appropriately. If the wire gauge is inadequate the
increased resistance and associated voltage drop may
result in insufficient voltage supply to the Thermostat. The
recommended wire gauge guidelines are as follows.
Min. Load = 4VA (all DOs OFF, No Sylk sensor).
If 18-20AWG wire is used for R, C, RC terminal,
Max. Load = 4A, 96VA (all DOs ON).
If 22AWG wire is used for R, C, RC terminal
Max. Load = 3A, 72VA (all DOs ON).
If R-Rc power jumper is not removed, then G, W1, W2, W3,
Y1, Y2, Y3 are powered from the Thermostat’s transformer.
Minimum load includes Thermostat and analog outputs at
full load (Max. 10V voltage output with 2Kohms load).
Every relay output is N.O. (Normally Open) contacts with a
maximum switch rating of 24VAC @1A (24VA). The allowed
maximum load is 96VA, which assumes all 8 relay output
loads are powered from the controller transformer. Actual
power requirements depend on connected loads.
IMPORTANT
Transformer sizing should never exceed the maxi-
mum UL Class 2 rating.
The 24VAC secondary leads are not interchangeable.
Once a lead connects to the GND terminal, it is the
grounded lead. Observe and maintain polarity for
subsequent connections. The GND terminal provides a
reference ground for the circuit board and
communications wiring. Use 18 AWG cable for best results.
WEEE
WEEE (Waste of
Electrical and
Electronic Equipment)
• At the end of the product life,
dispose of the packaging and
product in an appropriate recycling
center.
• Do not dispose of the device with
the usual domestic refuse.
• Do not burn the device.
Product/Part Code
Substance
Name
CAS
Number
Only TC500A thermostat
mainboard PCBA,
thermostat wall plate board
PCBA
Lead 7439-92-1
Lead oxide 1317-36-8
NO
YES
4 FEET
(1.2 METERS)
NO
NO
Diode
+ DC Voltage
GND
Capacitor
Power Terminals
24VAC
R
C
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